Louis Joubert Lock

The Louis Joubert Lock (French: Forme Ecluse Louis Joubert), also known as the Normandie Dock, is a lock and major dry dock located in the port of Saint-Nazaire in Loire-Atlantique, northwestern France.

Owned by the Port authority of Nantes-Saint-Nazaire, its strategic importance as a major naval construction and maintenance asset since its completion in 1934 resulted in it becoming the main target of the British Army Commando raid of 1942, the St. Nazaire Raid, to stop German battleships such as Tirpitz from accessing maintenance facilities while operating in the Atlantic Ocean.